0. Make multiple
encrypted copies. On DVDs (they are better than CDs and Blu-Ray discs; DVD+R are better than DVD-R), paper, cloud services like DropBox, OneDrive, Google Drive, e-mail it to yourself and to your friends, use P2P storage services like
MaidSafe, Storj and Sia, etc.
1.
Use proper font when printing PGP encrypted keys on paper.
2.
Flash memory (SSD, USB flash drives, hardware wallets) is less reliable when not powered regularly (i.e. every week).
3. Use error correction methods like Parchive and ZFS.
4. Print on paper or store on digital media only encrypted data.
5. Your encryption software should use CPU/RAM-intensive KDF (i.e.
scrypt with secure options - do not use defaults!). First, encrypt with scrypt and then encrypt it again with PGP (using different password!) in
ASCII armor mode before print it (other methods like QR codes may not be reliable as multiple copies of the PGP ASCII armor).
Do not use the same password for the PGP because it's easy to brute force…
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